thing magic appnote-designing race timing applications-611

8/2/2019 Thing Magic AppNote-Designing Race Timing Applications-611

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APPLICATION NOTE

One Cambridge Center, Cambridge, MA 02142 Tel: 866-833-4069 www.thingmagic.com 6/11

Designing Race Timing Applications Using UHF RFID Technology

By Kapil Asher

Introduction

UHF passive RFID is becoming extremely popular in race timing application development due to its cost

effectiveness, ease of use, scalability and reliability. This application note describes how one might

design a robust race timing system using ThingMagic UHF RFID technology. The application note

assumes the reader to be generally familiar with RFID technology and the ThingMagic MercuryAPI.

Note:Code samples are provided as examples only and will need to be modified to work in your solution

environment.

UHF RFID in Race Timing

Typical race timing applications are comprised of three major parts -

Checking-in participants before the race

Historically, race coordinators have set up registration booths to manually cross reference

names on a sheet of paper to check-in racers on race day. This slow process can be eliminated

by mailing pre-associated RFID-enabled race bibs or other race tags to the racers in advance.

RIFD enabled participants get checked-in automatically via an RFID reader at the starting

point. If race preparation beforehand is not possible, tags can be easily associated to

participants on race day using desktop RFID readers.

Recording critical timestamps of a participant during the race

Race coordinators record the time taken by each participant to complete a number of

milestones. When handled manually, the process is tedious and prone to human error,especially in large races like marathons which are typically attended by thousands of runners.

This timestamp data then gets fed to a database for results reporting, which can be further

delayed if done manually. RFID systems can automate the collection of timestamps by reading

the participants tag at critical locations and updating them to a central database using

GPRS/EDGE/3G technology or by utilizing the data write feature to store the timestamps and

checkpoints directly on the tag, which is then interrogated at the end of the race for stored


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information. This time-sensitive application requires fast data transfer between the reader and

the tag and minimal back-end overhead.

Presenting data in a consumable format

Race statistics are stored on servers that are accessible via web interfaces for participants to

check their performance. RFID readers that are network-ready can easily stream data to servers

via ethernet, WiFi, EDGE/GPRS/3G. In case connectivity cannot be achieved, the data can be

stored on-board the RFID reader and transferred later.

ThingMagic UHF RFID Readers

Variety of RFID readers ThingMagic designs one of the largest varieties of UHF RFID readers in the market, with

remarkable consistency in superior performance. ThingMagic RFID readers can be interfaced via

USB, RS232, Ethernet and WiFi, giving expansive options to connect to the rest of the system.

ThingMagic RFID readers are designed for rugged environments, with some models providing up

to 4 antenna ports and the option to use RF multiplexers for broader coverage.

The ThingMagic USB RFID reader is designed for desktop applications and is ideal for associating

tags to racers on race day. It is powered via USB and has an integrated antenna with a read

range of less than 12 inches to ensure programming only at a close range, thus avoiding

association to an unintended tag. The reader has 2 LEDs for visual confirmation of association

success and 2 buttons for triggering events.

More info - http://www.thingmagic.com/usb-rfid-reader

The ThingMagic Mercury6 (M6) reader is a network-ready UHF RFID reader that is ideal for

reading tags on participants on race day. Out-of-the-box, each M6 reader can be connected to 4

antennas, giving broad RF coverage on the racetrack or route. Its continuous mode of

transmission allows no down time in polling tags which ensures no missed reads during the race.

This mode is asynchronous to other processes in the system allowing uploading data to servers

at the same time as reading new RFID tags. Its high sensitivity and a read rate of greater than

400 tags/sec ensures reads in unfavorable tag orientations. M6 readers can update tag data on

the fly without the requirement of stopping reads, allowing the storage of timestamps and

checkpoints on the tag memory quickly and efficiently. It can be configured to operate at higher

physical data rates by utilizing the Gen2 FM0 modulation scheme and a backscatter link

frequency of 640KHz. The M6 reader can read IP-X tags that have smaller transaction durations

than Gen2 and may be favorable for races.

More info - http://www.thingmagic.com/fixed-rfid-readers/mercury6

Seamless software integration ThingMagic readers are available with an SDK for the following platforms C, C#/.Net and Java.

The SDK is designed for cross-product development allowing software engineers to program

middleware for all ThingMagic readers without special installation of drivers and dlls required


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for specific readers. Function calls and parameters are the same for all readers with the

exception of unsupported features on particular reader hardware. An example of a middleware

that works with any ThingMagic reader can be found here (Universal Reader Assistant) -

http://www.thingmagic.com/support-

login?username=api&return=/download?func=startdown%26id=36

The ThingMagic Universal Reader Assistant (screen shot below) is one of several tools provided by

ThingMagic to help with developing powerful RFID-enabled solutions.

Embedded reader advantage

The core of the ThingMagic technology lies in embedded UHF RFID modules that are integrated

with other hardware to develop the finished readers. These modules, built over the Atmel ARM

microcontroller and RFID ASIC are powered with RFID read and write capabilities in a small form

factor. The modules are designed to work for +5VDC (+3 to 5.5VDC for M5eC). A single off-the-

shelf cable provides power and data to the modules, eliminating complex solder jobs for

hardware integration. ThingMagic modules can be seamlessly integrated with existing

telematics hardware allowing faster RFID data transfer to a previously designed system. A highlevel of control is available via the same MercuryAPI used for ThingMagic finished readers,

allowing customers to program their power consumption scheme, boot-up configuration scripts

and data transfer rate.

More info: http://www.thingmagic.com/embedded-rfid-readers


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Configuration guidelines with code sample

USB Reader

A simple codelet below shows how to configure the USB reader to perform an association

between the EPC tag and the race participant.

Please note: this codelet is a guideline and will need to be modified to work in your

environment.

Step 1: Configure the reader

Step 2: Define Tag Read Event Listener to store tags in the software buffer

NOTE: Antenna selection and placement are important elements of successful RFID solution

performance. To ensure read zone performance and precise and uninterrupted tag-fixed reader

communications, be sure the RFID antennas you select meet the performance specifications

required for the environments and conditions in which you will be reading tags. ThingMagic offers a

variety of RFID antennas for solution development and can assist with selecting the appropriate

antennas for your deployment needs.


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Step 3: Read tags

Step 4: Associate tag EPCs to racers


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Mercury 6 Readers

A. The codelet below shows how to configure the Mercury6 reader to perform continuous readoperation using read plans.


environment.

Step 1: Configure the reader The example below shows the configuration for a gen2 protocol

tag. If the system includes IPX tags instead, the variable tagProto below should be

TagProtocol.IPX256 or TagProtocol.IPX64 depending on the type of IPX tags used.


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Step 2: Define Tag Read Event Listener to store tags in the software buffer

Step 3: User has to define a function to connect to the central database and feed it with

tagDataBaseForM6 populated in the above codelet.

Step 4: Read tags using StartReading() that initiates asynchronous continuous reading mode.


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B. The codelet below shows how to perform writing data to a tag while reading other RFIDtags.


environment.

This is achieved by modifying the initialize process to include the write data operation. The

continuous streaming mode is not supported with embedded tag operations and the reader

enters a pseudo asynchronous mode where it performs reads and writes in busts with negligible

RF off time between operations.


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Step2: Perform reading of tags as shown in Section A - Steps 2 to Step 4 once the write data

operation is defined as shown above.

Summary

Races of all types can be timed by hand with operators using a stop-watch, or by using a combination of

electronic timing and video camera systems. As with many time-sensitive activities however, UHF RFID

has proven to be a more efficient alternative to manual tracking by reducing human error and providing

the ability to process a greater amount of data in a shorter period of time.

As noted above, with multiple of areas of race timing benefiting from RFID, reader form factor is an

important consideration. With ThingMagic broad portfolio of fixed/finished and embedded UHF RFID

readers, one can develop highly integrated end-to-end race timing solutions. Equally important is tag

read performance, including the RFID readers ability to continuously read moving tags in a densely

populated field, a high tag read rate, and a configurable read range. The ability to easily integrate RFID

data into back-end applications should also be considered when selecting RFID readers for your racetiming solution.

In addition to the applications noted above, UHF RFID can also be used to enhance the racer and

spectator experience during the event. Through the combination of RFID-enabled tags and check points,

sponsors can display messages on big screens for a given group of racers (e.g. employees of a particular

company). Further, personal motivational messages could be displayed on screens for friends and family


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participating in the race or real-time statistical information of a particular racer could be presented at

different check points, giving racers an idea of their performance in relation to the rest of the field.

Many of these innovative features can only be achieved in real-time through the use of UHF RFID.

RFID-enabled race timing solutions are offered by companies around the globe, including several

ThingMagic partners. For more information, visit www.thingmagic.com.

2011 ThingMagic a division of Trimble Navigation Limited. ThingMagic and The Engine in RFID are registered

trademarks of Trimble Navigation Limited. Other marks may be protected by their respective owners. All Rights

Reserved. To purchase ThingMagic products or to inquire about how ThingMagic can help with your Advanced

Development Project, email [email protected] or call 1-866-833-4069 (International callers +1 617-499-4090).

www.thingmagic.com

thing magic appnote-designing race timing applications-611

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